Guy was the son of Guillaume II de Mauvoisin and Adeline le Bosc. The date and place of his birth have not been found.
He died about 1211. The place is not known.
His wife was Aelis de Porhoët, who he married in 1201. The place has not been found. Their two known children were Guy IV (c1190-1252/53) and Marie (c1205-?).
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Guy III de Mauvoisin |
Guillaume II de Mauvoisin |
Raoul de Mauvoisin |
Raoul II de Mauvoisin |
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Brita |
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Adeline le Bosc |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Death | ABT 1211 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | seigneur de Rosny |